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- Citadel CEO Ken Griffin is trying to get Donald Trump to debate Nikki Haley.
- The billionaire said he wanted to see the pair engage in a "battle of ideas," not name-calling.
- He highlighted Haley as Trump's main rival, but said he was still deciding if he wanted to back her.
Hedge fund boss Ken Griffin on Tuesday urged former President Donald Trump to take on fellow presidential hopeful Nikki Haley in a GOP primary debate.